Configuration Storage
Introduction
Configuration Storage (Shared Preferences) is a lightweight storage interface on the Android platform. It is a key-value style database suitable for storing small amounts of application data (such as configuration information) and shared configuration information between applications.
Built-in semaphore, thread-safe
Does not support interrupt calls
Supports integer, string, and binary data block access
Enable the Module
The configuration menu path in menuconfig is: SiFli Middleware -> Enable share preference
Usage
Below is an example of the alarm application obtaining and storing the alarm list:
typedef struct{
bool enable;
char title[32]; // Alarm name
time_t time; // Time
uint32 repeat; // Period repeat
} alarm_info_t;
void app_alarm_main(int argc, char **argv)
{
rt_err_t res = RT_EOK;
alarm_info_t alarm_list[16];
int32_t list_len;
/* Open a preference */
share_prefs_t *pref = share_prefs_open("alarm", SHAREPREFS_MODE_PRIVATE);
/* Read alarm list */
list_len = share_prefs_get_int(pref, "list_len", -1);
if (list_len > 0)
{
res = share_prefs_get_block(pref, "list", &alarm_list, list_len * sizeof(alarm_info_t));
assert(res == SF_EOK);
}
/* User edits alarm */
...
/* Save alarm list */
if (list_len > 0)
{
res = share_prefs_set_block(pref, "list", &alarm_list, list_len * sizeof(alarm_info_t));
assert(res == SF_EOK);
res = share_prefs_set_int(pref, "list_len", list_len);
assert(res == SF_EOK);
}
res = share_prefs_close(pref);
}